Connection device for a device for charging an electrical energy accumulator, charging device and electric vehicle

Abstract

The present invention relates to the connection of a charging circuit for charging an electrical energy accumulator by means of a single-phase or multi-phase electrical alternating voltage. To this end, a filter means for suppressing interfering signals is provided at an input before a switchover between a single-phase or multi-phase charging process. In this way, the properties, in particular the capacitive properties, of the filter means are not influenced by the circuit configuration at the switchover between single-phase or multi-phase charging.

The invention claimed is: 
     
       1. A connection device for a device for charging an electrical energy accumulator ( 5 ), comprising:
 an input connection ( 11 ) having a plurality of phase connections, wherein the input connection ( 11 ) is configured to be selectively connected to either a single-phase or a multi-phase electrical power source ( 3 ); 
 an output connection ( 12 ) having a plurality of phase connections, wherein the output connection ( 12 ) is configured to be connected to a device ( 4 ) for charging an electrical energy accumulator ( 5 ); 
 a switching means ( 2 ) configured to selectively electrically connect one or more electrical phases (L 1 , L 2 , L 3 ) of the input connection ( 11 ) to corresponding phase connections of the output connection ( 12 ), wherein the switching means ( 2 ) includes switching elements configured to couple the one or more electrical phases (L 1 , L 2 , L 3 ) of the input connection ( 11 ) to corresponding phase connections of the output connection ( 12 ) for connecting the device ( 4 ) for charging the electrical energy accumulator ( 5 ); and 
 a filter means ( 1 ) configured to filter out electrical interfering signals on the electrical connections between the input connection ( 11 ) and the output connection ( 12 ), wherein the filter means ( 1 ) is arranged electrically between the input connection ( 11 ) and the switching means ( 2 ). 
 
     
     
       2. The connection device according to  claim 1 , wherein the filter means ( 1 ) comprises at least a first Y capacitor assembly, wherein in the first Y capacitor assembly a respective capacitor element (Cy) is arranged between an electrical phase (L 1 , L 2 , L 3 ) and a reference potential (PE). 
     
     
       3. The connection device according to  claim 1 , wherein the filter means ( 1 ) comprises a serial circuit consisting of a first Y capacitor assembly, a first inductive filter element ( 11 ), and a second Y capacitor assembly. 
     
     
       4. The connection device according to  claim 1 , wherein the filter means ( 1 ) comprises a serial circuit consisting of a first Y capacitor assembly, a first inductive filter element ( 11 ), a second Y capacitor assembly, a second inductive filter element ( 12 ), and a third Y capacitor assembly. 
     
     
       5. The connection device according to  claim 1 , having a voltage detector ( 14 ) configured to detect an electrical voltage on the phase connections of the input connection ( 11 ),
 wherein the switching means ( 2 ) is configured to electrically connect a respective phase connection of the input connection ( 11 ) to a corresponding phase connection of the output connection ( 12 ) when the electrical voltage at the respective phase connection of the input connection ( 11 ) exceeds a predetermined threshold value. 
 
     
     
       6. A charging device for charging an electrical energy accumulator ( 5 ), comprising:
 a connection device having
 an input connection ( 11 ) having a plurality of phase connections, wherein the input connection ( 11 ) is configured to be selectively connected to either a single-phase or a multi-phase electrical power source ( 3 ); 
 an output connection ( 12 ) having a plurality of phase connections, wherein the output connection ( 12 ) is configured to be connected to a device ( 4 ) for charging an electrical energy accumulator ( 5 ); 
 a switching means ( 2 ) configured to selectively electrically connect one or more electrical phases (L 1 , L 2 , L 3 ) of the input connection ( 11 ) to corresponding phase connections of the output connection ( 12 ), wherein the switching means ( 2 ) includes switching elements configured to couple the one or more electrical phases (L 1 , L 2 , L 3 ) of the input connection ( 11 ) to corresponding phase connections of the output connection ( 12 ) for connecting the device ( 4 ) for charging the electrical energy accumulator ( 5 ); and 
 a filter means ( 1 ) configured to filter out electrical interfering signals on the electrical connections between the input connection ( 11 ) and the output connection ( 12 ), 
 wherein the filter means ( 1 ) is arranged electrically between the input connection ( 11 ) and the switching means ( 2 ); and 
 
 the device ( 4 ) for charging the electrical energy accumulator ( 5 ) configured to charge the electrical energy accumulator ( 5 ) using a single-phase or multi-phase electrical alternating voltage provided at the input connection ( 11 ) of the connection device. 
 
     
     
       7. An electric vehicle having:
 an electric drive system; 
 an electrical energy accumulator ( 5 ); and 
 a charging device for charging the electrical energy accumulator ( 5 ) according to  claim 6 . 
 
     
     
       8. The connection device according to  claim 1  wherein, when a charging voltage is provided on only one phase of the one or more electrical phases (L 1 , L 2 , L 3 ) of the input connection ( 11 ), the switching means ( 2 ) is configured to couple, by means of corresponding switch positions in the switching means ( 2 ), the charging voltage to the phase connections of the output connection ( 12 ).